Magellan TRX7 GPS Replacement Battery 3.7V 3800mAh

Magellan TRX7 — 3.7V Li-Polymer Replacement Battery (N496)

This 3.7V, 3800mAh Li-Polymer cell replaces the N496 battery in the Magellan TRX7 portable GPS navigator. It restores full operating power to the TRX7 for outdoor navigation, trail mapping, and route tracking. Dimensions are 96.80 × 56.40 × 5.35mm — match these against your original cell before fitting.

• TRX7 fit: The N496 battery uses a flat Li-Polymer cell format specific to the TRX7 chassis. The connector pinout and BMS handshake are matched to the TRX7's power management board, so the device reads state-of-charge correctly from the first power-on.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held the low-voltage cutoff cleanly and the TRX7 reported accurate charge levels throughout — no false full readings at the top of the cycle.
• First cold start after fitting: After fitting this cell, power the TRX7 on outdoors and let it acquire a satellite fix before use. A cold start after full power removal takes 5–10 minutes for the first fix. Subsequent warm starts drop to under a minute once almanac data is cached.

GPS accuracy reduced as the TRX7 battery drains

Some GPS units step down receiver sensitivity when battery voltage drops below a set threshold. The TRX7 GPS receiver draws consistent power during active navigation, but at low battery the device may reduce RF gain to protect remaining charge. This shows up as weaker satellite signal bars and occasional position drift. Keeping the cell above 3.5V during active use avoids the threshold where sensitivity reduction kicks in.

TRX7 shuts off without low-battery warning

After a battery swap, the TRX7's charge indicator can be uncalibrated against the new cell. The device reads the fuel gauge from a learned discharge curve tied to the old cell. With a fresh cell, the voltage-threshold trigger for the warning can fire late, giving little or no visual alert before cutoff. Run two full charge-discharge cycles to let the TRX7 recalibrate its indicator — after that, the low-battery warning should appear at approximately 3.55V.